Hey everyone, Aquaman here with FilterDoctor.com. Today we’re looking at the PRE-RO. You may also know it as the 32175050100. This is a 5 micron carbon block compatible with a number of Culligan reverse osmosis systems. The most common ones are the AC15, AC30, LC50 and the H83. It’s also used to replace these part numbers; Culligan 000011-38 and the Culligan 004027-96, and the Microline S7025. It is a basic carbon pre-filter for reverse osmosis systems. It simply removes the chlorine that your membrane is normally allergic to. And it will do that for about 6 months before it needs to be replaced. This is the Culligan Compatible PRE-RO, also known as the 32175050100, and I’m your host Aquaman with FilterDoctor.com. Thanks for watching.